Abstract
The expression of an oncofetal protein, the glypican-3 (GPC3), was immunohistochemically evaluated in a wide variety of primary testicular germ-cell tumors (GCTs) in comparison with other markers, alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG)-beta, and OCT3/4. Eighty-nine cases of GCT including 22 cases of mixed GCT were evaluated with reference to each tumor component. GPC3 expression was observed in neoplastic cells of yolk-sac tumor (YST) (25/25), teratoma (2/10), components of syncytiotrophoblastic giant cells (STGCs) (10/14), and choriocarcinoma (1/3), but none in intratubular germ-cell neoplasias, unclassified type (0/33), seminomas (0/61), or embryonal carcinoma (0/19). All cases of YST showed diffuse labeling of neoplastic cells in cytoplasmic and membranous patterns, and the positive area of GPC3 was much larger than that of AFP. Glandular structures in teratomas showed GPC3 immunostaining as well as AFP. Although the number of GPC3-positive cells was smaller in STGC components and choriocarcinoma, there was no diffusion artifact in GPC3 immunostaining, as was frequently encountered in hCG-beta staining. Thus, GPC3 is a unique oncofetal protein, which is useful as an immunohistochemical marker for GCT differentiated to extraembryonic tissue, especially YST.
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Acknowledgements
We are grateful to Ms. Y. Ohno for her technical assistance. This study was supported by the program for the Promotion of Fundamental Studies in Health Sciences of the National Sciences of the National Institute of Biomedical Innovation (NIBIO).
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Ota, S., Hishinuma, M., Yamauchi, N. et al. Oncofetal protein glypican-3 in testicular germ-cell tumor. Virchows Arch 449, 308–314 (2006). https://doi.org/10.1007/s00428-006-0238-x
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DOI: https://doi.org/10.1007/s00428-006-0238-x